CAJ | 학술논문

采用电沉积和旋转涂膜相结合的方法成功制备了高度有序的TiO2/Au纳米棒阵列催化剂.扫描电镜和透射电镜结果表明,TiO2薄膜均匀地包覆在Au纳米棒的表面,形成核壳型的一维阵列结构.X射线衍射分析表明所获得TiO2为(101)晶面优先生长的锐钛矿晶相.紫外-可见漫反射光谱显示,由于Au和TiO2间肖特基结的存在造成吸收红移,Au纳米棒表面的等离子共振效应导致400～800 nm间出现吸收峰.在紫外光催化降解罗丹明B反应中,TiO2/Au纳米棒阵列催化剂表现出优异的催化活性,其动力学常数分别为TiO2和TiO2/Au膜的2.0和1.3倍.这主要归结于Au与TiO2间的肖特基结和一维阵列结构所带来的大的比表面积、宽的光响应范围和有效的光生载流子分离与传递.
채용전침적화선전도막상결합적방법성공제비료고도유서적TiO2/Au납미봉진렬최화제.소묘전경화투사전경결과표명,TiO2박막균균지포복재Au납미봉적표면,형성핵각형적일유진렬결구.X사선연사분석표명소획득TiO2위(101)정면우선생장적예태광정상.자외-가견만반사광보현시,유우Au화TiO2간초특기결적존재조성흡수홍이,Au납미봉표면적등리자공진효응도치400～800 nm간출현흡수봉.재자외광최화강해라단명B반응중,TiO2/Au납미봉진렬최화제표현출우이적최화활성,기동역학상수분별위TiO2화TiO2/Au막적2.0화1.3배.저주요귀결우Au여TiO2간적초특기결화일유진렬결구소대래적대적비표면적、관적광향응범위화유효적광생재류자분리여전체.
A highly ordered TiO2/Au nanorod array was successfully fabricated by direct current electrodeposition and subsequent spin-coating.Scanning electron microscopy and transmission electron microscopy images revealed that the TiO2 film completely covered the surface of the Au nanorods,which resulted in TiO2 shell Au core nanorods.X-ray diffraction patterns revealed that the TiO2 film was anatase with preferential orientation in the (101) plane.UV-Vis diffuse reflectance spectra showed a shift in the absorption edge toward the visible region because of the formation of a Schottky junction between Au and TiO2.A new absorption peak that ranged from 400 to 800 nm appeared because of the localized surface plasmon resonance of the Au nanorod arrays.For the photocatalytic degradation of rhodamine B under UV light irradiation,the TiO2/Au nanorod array exhibited excellent photocatalytic activity and its kinetic constant was 2.0 times that of pristine TiO2 and 1.3 times that of a TiO2/Au film.The enhanced photocatalysis was attributed to the high surface volume ratio,an improved UV light response,efficient separation,and the convenient migration of photogenerated charge carriers because of the one-dimensional nanorod structure and the Schottky junction between Au and YiO2.This work could provide new insights into the fabrication of a high performance photocatalyst and thus facilitate practical environmental applications.